* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 16px;
    color: #2d3748;
}

.container {
    text-align: center;
    max-width: 800px;
    width: 100%;
    animation: fadeInUp 0.8s ease-out;
}

header {
    padding: 60px 40px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.8);
}

.main-heading {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    line-height: 1.2;
    color: #1a202c;
    animation: fadeIn 1s ease-out 0.2s both;
}

.sub-heading {
    font-size: clamp(1.1rem, 2.5vw, 1.5rem);
    font-weight: 400;
    line-height: 1.6;
    opacity: 0.8;
    letter-spacing: 0.01em;
    animation: fadeIn 1s ease-out 0.4s both;
    color: #4a5568;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive adjustments */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }
    
    header {
        padding: 40px 30px;
    }
    
    .main-heading {
        margin-bottom: 20px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 10px;
        align-items: flex-start;
        padding-top: 40px;
    }
    
    .container {
        max-width: 100%;
    }
    
    header {
        padding: 32px 24px;
        border-radius: 16px;
    }
    
    .main-heading {
        margin-bottom: 16px;
        font-size: clamp(2rem, 8vw, 2.5rem);
    }
    
    .sub-heading {
        font-size: clamp(1rem, 4vw, 1.2rem);
        line-height: 1.5;
    }
}

@media (max-width: 320px) {
    header {
        padding: 24px 20px;
        border-radius: 12px;
    }
    
    .main-heading {
        margin-bottom: 12px;
    }
}